Improvement in trileaf scales



L. H. CRANE 8:. A. A. MINER.

Trileaf-Scale.

No. 165,476, P'atented'1uIy '|3,]875.

UNITE STATES PATENT CFFIGE.

LUGIUS H. CRANE AND ALBERT A. MINER, OF BRATTLEBOROUGH, VT.

IMPROVEMENT IN TRILEAF SCALES.

Specification forming part of Letters Patent No. 165,476. dated July 13, 1875; application filed J une 12, 1875.

To all whom it may concern:

Be it known that we, LUOIUS H. CRANE and ALBERT A. MINER, of Brattleborough,

Windham county, Vermont, have invented a new and useful Improvement in Trileaf Scales, of which the following is a specification:

Our invention relates to new and usetulimprovements in measuring-scales of t-rihedral form, used in drawing and .in dividing spaces into equal proportions; and it consists in making the leaves detachable, and so that they, or any one of them, may be drawn out from a common central core to elongate the scale.

Figure 1 is a view of the scale. Fig. 2 is a cross-section, enlarged; and Fig. 3 is a longithese grooves, the sides of the leaves near one edge being grooved to receive the proections I). This construction allows the leaves to be withdrawn or the scale extended by drawing out one of the leaves more or less, as may be required. The sides of the leaves are graduated to any desired scale, as seen in Figs. 1 and 3, so that almost a. any desired space may be obtained. At one end of the core there is a nut, 0, (there may be a nut at each end, if desired,) which screws onto the core when the leaves are in place in the grooves of the core, and prevents the leaves from being withdrawn.

Ordinarily these trileaf. scales are made with the leaves rigidly fastened together; but by our method the scale is made much more valuable, for nearly all the'purposes for which it is designed, than it would be constructed after the old method.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- A trileat scale having a central core (or rod) with the leaves grooved into it.'substantially as shown and described, so that one or more may be withdrawn wholly or in part, as specified, for the purposes set forth.

LUOIUS H. CRANE. ALBERT A. MINER. Witnesses:

CHARLIE E. BARRETT, ELMEE REED. 

